[1] Monaldi Hosp, Cardiomyopathies & Heart Failure Unit, Via Leonardo Bianchi, I-84100 Naples, Italy
[2] Great Ormond St Hosp Sick Children, Dept Cardiol, Ctr Inherited Cardiovasc Dis, Great Ormond St, London WC1N 3JH, England
[3] UCL Inst Cardiovasc Sci, Dept Cardiol, Gower St, London WC1E 6BT, England
[4] Univ Salerno, Cardiol Div, I-84131 Salerno, Italy
[5] Univ Michigan, Div Cardiovasc Med, Dept Internal Med, 1500 East Med Ctr Dr, Ann Arbor, MI 48109 USA
[6] Univ Campania Luigi Vanvitelli, Dept Cardiothorac Sci, Via Leonardo Bianchi, I-84100 Naples, Italy